The triple murder and suicide horrified and shocked residents of the 400-space mobile home community about 35 miles northwest of Denver where the shooting occurred.

"It just shows you that it can happen anywhere," said Weld County Sheriff John Cooke. "Domestic violence knows no boundaries."

Daniel Sanchez, 31, shot his ex, Beatriz Cintora-Silva, 25, her sister, 22, and her sister's husband, 29, before turning the gun on himself about 4 a.m. Tuesday, Cooke said.

Sanchez shot out the glass back door of the home, and then shot all three victims multiple times before shooting himself in the head with a .45-caliber Glock handgun, Cooke said. Cintora-Silva called 911 and gave her address before being shot, Cooke said.

Sanchez had been released from jail six hours earlier. He had been arrested Sunday after Cintora-Silva said he hit her, stole her cell phone and then sent threatening text messages to her new boyfriend, authorities said.

Sanchez stalked Cintora-Silva to her sister's home after their Thanksgiving breakup, sitting outside in his truck to watch her lights go out at night, according to a police report detailing his arrest. Police say Sanchez held Cintora-Silva hostage for several hours Saturday, demanding information about her new relationship.

In a report about the Saturday incident that was released Tuesday afternoon, police said while Sanchez drove Cintora-Silva around in his vehicle against her will, he called her derogatory names. "Daniel would then tell Beatriz he was sorry and he loved her. Daniel offered to take Beatriz to a hotel so he could make love to her."

Sanchez eventually released Cintora-Silva, and she reported the incident but declined additional protection, police said. Sanchez was arrested Sunday afternoon, and spent one night behind bars before being released at 10 p.m. Monday after posting a $10,000 bond.

Cooke said Cintora-Silva was alerted by authorities when Sanchez was released from jail, and authorities are working to piece together his last hours, including where and when he got the handgun.

At about 4 a.m., Cintora-Silva's neighbors heard repeated gunshots from the cream trailer -- "pop, pop, pop," said Manuel Nunez, 58 -- and a woman called 911 from inside and blurted out the address.

"The dispatcher heard 'No, no, no,' and then gunshots," said sheriff's spokesman Tim Schwartz. "A male party then picks up the phone and says he's going to kill himself. The dispatcher hears another gunshot."

Deputies and the SWAT team raced to the neighborhood and found the four dead inside. Cooke said autopsies are scheduled for Wednesday.

The neighborhood where the shooting occurred is a permanent mobile home park, and residents said they were shocked to see such violence in the relatively rural area.